20. REASONINGThe relation 2tanvrgθ=(Equation 5.4) determines the banking angle that a banked curve of radius rmust have if a car is to travel around it at a speed vwithout relying on friction. In this expression gis the magnitude of the acceleration due to gravity. We will solve for vand apply the result to each curve. The fact that the radius of each curve is the same will allow us to determine the unknown speed. SOLUTIONAccording to Equation 5.4, we have
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